How to Prepend a String to a Variadic Slice of Interfaces in Go?

Prepending a String to a Variadic Slice of Interfaces

Consider a situation where you have a method that accepts a variable number of arguments of type ...interface{}. To prepend a string to this slice, you may encounter issues with using append() directly.

In such cases, the standard append() function expects the first argument to be a slice and subsequent arguments to match the type of the elements within the slice:

func append(slice []Type, elems ...Type) []Type

To address this issue, you can create a wrapper []interface{} for your initial string and then use append() to combine the string and the variadic slice:

s := "initial string"
rest := []interface{}{"element 1", "element 2"}

all := append([]interface{}{s}, rest...)
fmt.Println(all)

Output:

[initial string element 1 element 2]

By wrapping the string as a []interface{}, you ensure that it matches the expected type for append() and allows you to successfully prepend it to the variadic slice.

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